Elbow patterns for all forms of pipe, a treatise upon the elbow pattern explaining the most simple and accurate methods for obtaining the patterns for elbows in all forms of pipe made from sheet metal, with useful mathematical rules and tables
Elbow patterns for all forms of pipe, a treatise upon the elbow pattern explaining the most simple and accurate methods for obtaining the patterns for elbows in all forms of pipe made from sheet metal, with useful mathematical rules and tables
